Without delay, let's solve this. We've got 12 and we will be multiplying it by 66, that is, adding 12 to itself 66 times.
Step 1: 0 + 12 = 12
Step 2: 12 + 12 = 24
Step 3: 24 + 12 = 36
Step 4: 36 + 12 = 48
Step 5: 48 + 12 = 60
Step 6: 60 + 12 = 72
Step 7: 72 + 12 = 84
Step 8: 84 + 12 = 96
Step 9: 96 + 12 = 108
Step 10: 108 + 12 = 120
Step 11: 120 + 12 = 132
Step 12: 132 + 12 = 144
Step 13: 144 + 12 = 156
Step 14: 156 + 12 = 168
Step 15: 168 + 12 = 180
Step 16: 180 + 12 = 192
Step 17: 192 + 12 = 204
Step 18: 204 + 12 = 216
Step 19: 216 + 12 = 228
Step 20: 228 + 12 = 240
Step 21: 240 + 12 = 252
Step 22: 252 + 12 = 264
Step 23: 264 + 12 = 276
Step 24: 276 + 12 = 288
Step 25: 288 + 12 = 300
Step 26: 300 + 12 = 312
Step 27: 312 + 12 = 324
Step 28: 324 + 12 = 336
Step 29: 336 + 12 = 348
Step 30: 348 + 12 = 360
Step 31: 360 + 12 = 372
Step 32: 372 + 12 = 384
Step 33: 384 + 12 = 396
Step 34: 396 + 12 = 408
Step 35: 408 + 12 = 420
Step 36: 420 + 12 = 432
Step 37: 432 + 12 = 444
Step 38: 444 + 12 = 456
Step 39: 456 + 12 = 468
Step 40: 468 + 12 = 480
Step 41: 480 + 12 = 492
Step 42: 492 + 12 = 504
Step 43: 504 + 12 = 516
Step 44: 516 + 12 = 528
Step 45: 528 + 12 = 540
Step 46: 540 + 12 = 552
Step 47: 552 + 12 = 564
Step 48: 564 + 12 = 576
Step 49: 576 + 12 = 588
Step 50: 588 + 12 = 600
Step 51: 600 + 12 = 612
Step 52: 612 + 12 = 624
Step 53: 624 + 12 = 636
Step 54: 636 + 12 = 648
Step 55: 648 + 12 = 660
Step 56: 660 + 12 = 672
Step 57: 672 + 12 = 684
Step 58: 684 + 12 = 696
Step 59: 696 + 12 = 708
Step 60: 708 + 12 = 720
Step 61: 720 + 12 = 732
Step 62: 732 + 12 = 744
Step 63: 744 + 12 = 756
Step 64: 756 + 12 = 768
Step 65: 768 + 12 = 780
Step 66: 780 + 12 = 792

So, 12*66 = 792